Paper trimmers with power ejecting means



Dec. 16, 1958 F. B. GURTENIUS 2,864,447

APER TRIMMERS WITH POWER EJECTING MEANS Filed April 2, 1956 IN V EN TOR.

57:27. j Weeer/c46, Cz/r/e/y/ko ATTORNEY United States Patent 2,864,447 PAPER TRIMMERS WITH POWER EJECTING MEANS Frederick B. Curtenius, Kalamazoo, Mich., assignor, by mesne assignments, to Rice Barton (Iorpora'tion, Worcester, Mass., a corporation of Massachusetts Application April 2, 1956, Serial No. 575,555

10 Claims. Cl. 164-59) This invention relates to improvements in paper trimmers with power ejecting means. The principle objects of this invention are:

First, to provide ejecting means for a paper trimmer that will eject the full load of paper on the trimmer from the trimmer table without disrupting the alined condition of the sheets in the load on the trimmer.

Second, to provide means for unloading a paper trimmer which will not require that the trimmed stack of paper be broken down into small bunches and then repiled. I

Third, to provide unloading mechanism for a paper trimmer which will handle piles of paper that are too heavy to be conveniently handled manually.

Fourth, to provide a trimmer machine that willtransfer its trimmed load of paper to a suitable receiving support without requiring manual handling of the paper.

Other objects and advantages of the invention will be apparent from a consideration of the following description and claims. The drawings, of which there is one .sheet, illustrate a highly practical form of the trimmer unloading mechanism.

Fig. l is a plan view of a paper trimmer with the load ejecting mechanism of the invention mounted thereon.

Fig. 2 is a side elevational view of the -trimmer.

Fig. 3 is an enlarged vertical cross sectional view through the ejector mechanism taken along the plane of the line 3-3 in Fig. 1.

Paper trimmers now commonly in use are heavy machines consisting of a suitable framework and table for supporting stacks of paper to be trimmed. A bridge or central cross piece above the table carries clamping mechanism for clamping the stack of paper in the desired position while a large power driven knife is projected upwardly from below the table to trim all the sheets of the stack to the same line. In order to accurately locate the stack of paper with respect to the knife the rear portion of the trimmer table has a transversely and vertically extending back guide that is reciprocable toward and away from the knife to push the stack into the desired position.

The drawings more or less conventionally illustrate the above described type of paper trimmer. The framework of the trimmer is indicated at 1 with the bridge or cross bar 2 extending between the sides of the framework above the table 3. Clamping mechanism on the bridge is conveniently illustrated at 4 as is the power operated knife 5. The table 3 projects rearwardly substantially behind the knife 5 and supports the back guide 6 which is an angle shaped member sliding on top of the table. Means such as the depending tongue 7 on the bottom of the back guide sliding in a slot 8 in the table maintains the back guide at all times perpendicular to the knife 5. The back guide 6 may be adjusted by means of a chain loop 9 connected to the tongue 7 underneath the table and selectively rotated by means of a motor 10. A position indicating band 11 is trained around a pulley 12 on the bridge and a rear pulley 13 on the pedestal 14 and an upright post 15 on the back guide is secured to the band so that movement of the back guide will rotate the band" and bring scale indicia on the band into view at the front of the trimmer indicating the distance of the back guide from the knife. All of the foreging is structure commonly old in the art and so is not described in greater detail.

6 is recessed as at 21 to receive the ejector heads so that The load ejecting mechanism applied to the trimmer consists of a pair of pneumatic cylinders 16 having their forward ends secured to the back side of the upright flange of the back guide. Pistons 17 and piston rods 18 are reciprocable in the cylinders and the piston rods project through bearings 19 and holes formed in the back guide. On their front ends the piston rods 18 carry circular ejector heads 20 that are reciprocable across the surface of the table 3. The front face of the, back guide the heads do not interfere with the proper functioning of the back guide in locating the work with reference. to the knife.

A column 22 positioned along side of the table 3 has i an arm 23 projecting over the rear portion of the table 3.

The column 22 and arm 23 support an air supply pipe 24 having a balanced T fitting 25 located centrally above the table 3. Flexible hoses 26 connect the two branches v of the T fitting to the two'cylinders 16. The supply pipe 24 is selectively supplied with air througha pipe 27 from the manual control valve 28 positioned at one side of the front of the trimmer where it can conveniently be actuated by the trimmer operator.

The length of the cylinders 16 and the stroke of the' i piston rods 18 is such that when the back guide 6 is in its forwardly adjusted position closely behind the trimmer knife 5 extension of the pistons and piston rods will advance the ejector heads 20 to or beyond the front edge of the table 3. The combined reciprocating motion of I the back guide and the ejector heads 20 is thus operative to push the full load of paper on the trimmer table forwardly off of the front edge of the table. The ejected load or stack of paper may be received on an automatic piling machine such as is described and claimed in my copending application for Paper Trimming and Piling Apparatus, Serial No. 571,752, filed March 15, 1956, or it may be received by any other suitable support such as a mobile table 29 supported on wheels 30 to be rolled up to the front edge of the trimmer to receive the trimmed stack. By use of the ejector mechanism the output of the trimmer may be materially increased by eliminating the time previously required to manually unload the trimmer in small bundles.

Having thus described the invention, what isclaimed as new and is desired to be secured by Letters Patent is:

1. In combination with a paper trimmer having a table with a back guide reciprocable along the rear of the table, paper ejecting means comprising a pair of pneumatic cylinders secured to the rear side of the vertical face of said back guide and projecting horizontally rearwardly in spaced relation above said table, pistons and piston rods reciprocably mounted in said cylinders with the rods projecting forwardly through said back guide, ejector heads on said rods on the forward side of said back guide, said back guide having recesses in the forward face thereof adapted to receive said ejector heads in the retracted positions of said pistons and rods, an air supply pipe extending in spaced relationship above the rear portion of said'table and having a T fitting located centrally above said cylinders, flexible hoses connecting said T fittings to said cylinders, and a manual control valve on the front of said trimmer connected to supply air to said pipe, the stroke of said pistons being long enough to extend said ejector heads to the front Patented Dec. 16, 1958 2. In combination with a paper trimmer having a table with a back guide reciprocable along the rear of the table,

paper ejecting means comprising a pair of pneumatic cylinders secured to the rear side of the vertical face of said back guide and projecting horizontally rearwardly in spaced relation above said table, pistons and piston rods reciprocably mounted in said cylinders with the rods projecting forwardly through said back guide, ejector heads on said rods on the forward side of saidback guide, said back guide having recesses in the forward face thereof adapted to receive said ejector heads in the retracted. positions of said pistons and rods, an air supply pipe extending in spaced relationship above the rear portion of said table, flexible hoses connecting said pipe to said cylinders, and a manual control on the front of said trimmer connected to regulate the supply of air to said pipe, the stroke of said pistons being long enough to extend said ejector heads to the front edge of the table when said back guide is in forwardly adjusted positions.

3. In combination with a paper trimmer having a table with a back guide reciprocable along the rear of the table, paper ejecting means comprising a pair of fluid cylinders secured to the rear of said back guide and projecting horizontally rearwardly, pistons and piston rods reciprocably mounted in said cylinders with the rods projecting forwardly through said back guide, ejector heads on said rods on the forward side of said back guide, said back guide having recesses in the forward face thereof adapted to receive said ejector heads in the retracted positions of said pistons and rods, a fluid supply pipe extending in spaced relationship above the rear portion of said table, flexible hoses connecting said pipe to said cylinders, and a manual control on the front of said trimmer connected to regulate the supply of fluid to said pipe, the stroke of said pistons being long enough to extend said ejector heads to the front edge of the table when said back guide is in forwardly adjusted positions.

4. In combination with a paper trimmer having a table with a back guide reciprocable along the rear of the table, paper ejecting means comprising an ejector head on the forward side of said back guide, said back guide having a recess in the forward face thereof adapted to receive said ejector head in the retracted position of said head, means including a fluid operated cylinder mounted on the back of said guide and having a piston connected to said head to advance said head forwardly of said back guide, a fluid supply pipe extending in spaced relationship above the rear portion of said table, a flexible hose connecting said pipe to said cylinder, and a control on the front of said trimmer connected to supply fluid to said pipe, the stroke of said piston being long enough to extend said ejector head to the front edge of the table when said back guide is in forwardly adjusted position.

5. In combination with a paper trimmer having a table with a back guide reciprocable along the rear of the table, paper ejecting means comprising an ejector head on the forward side of said back guide, said back guide having a recess in the forward face thereof adapted to receive said ejector head in the retracted position of said head, means mounted on said guide and connected to said head to advance said head forwardly of said back guide, and

a control on the front of said trimmer connected to actuate said advancing means, the stroke of said means being long enough to extend said ejector head to the front edge of the table when said back guide is in forwardly adjusted position.

6. In combination with a paper trimmer having a knife and a table with front and rear portions extending in front of and to the rear of said knife, a stop horizontally movably positioned on said table and having a vertical surface parallel to the path of movement of said knife, a first drive means having a movable part connected to move said stop forwardly and rearwardly across the rear portion of said table behind said knife, a second drive means carried by said movable part and connected to move said stop forwardly and rearwardly relative to said movable part and in front thereof, and control means connected to selectively actuate said drive means.

7. In combination with a paper trimmer having a knife and a table with front and rear portions extending in front of and to the rear of said knife, a stop horizontally movably positioned on said table and having a vertical surface parallel to the path of movement of said knife, a first drive means having a movable part connected to move said stop forwardly and rearwardlyacross the rear portion of said table behind said knife, a second drive means connected to move said stop forwardly and rearwardly relative to said movable part and in front thereof, and control means connected to selectively actuate said drive means.

8. In combination with a paper trimmer having a table with a back guide reciprocable along the rear of the table, paper ejecting means comprising an ejector head positioned over said table and movable in a direction parallel to the direction of movement of said back guide, said back guide having a recess in its forward face into which said head may be retracted so as not to obstruct the face of said back guide, a first power means connected to advance and retract said back guide, and a second power means connected to advance said head beyond the face of said back guide and retract said head into unobstructing relation to the face of said back guide, said second means having a range of movement suflicient to advance said head to adjacent the forward edge of said table when said back guide is in forwardly adjusted position.

9. In combination with a paper trimmer having a table with a back guide reciprocable along the rear of the table, paper ejecting means comprising an ejector head positioned over said table and movable in a direction parallel to the direction of movement of said back guide, and a power means connected to advance said head beyond the face of said back guide and retract said head into unobstructing relation to the face of said back guide, said power means having a range of movement suflicient to advance said head to adjacent the forward edge of said table when said back guide is in forwardly adjusted position.

10. In combination with a paper trimmer having a knife and a table with front and rear portions extending to the front and to the rear of said knife, a paper moving element positioned on said table movable thereacross in parallel relation to said knife and in forward and rearward directions relative to the knife, and power actuated means for operating said element, said means having a range of movement sufficient to advance said element to adjacent the forward edge of said table.

References Cited in the file of this patent UNITED STATES PATENTS 

